35+ privacy-first developer tools. All processing happens in your browser — zero data sent to any server.
- Privacy-first — No data ever leaves your browser. Every operation runs locally.
- Offline-capable — Works without an internet connection once loaded.
- 35+ tools — Formatters, converters, encoders, decoders, and more in one place.
- Free & open source — MIT licensed, community-driven, no paywalls.
| Category | Tools |
|---|---|
| Code Formatting | SQL Formatter, JSON Validator & Beautifier, YAML Formatter, HTML Min/Beautify, CSS Processor, JavaScript Formatter, Makefile Validator |
| Data Conversion | Base64 Encoder/Decoder, Base64 Image, CSV↔JSON, YAML↔JSON, PHP Array↔JSON, PHP Serializer, SVG→CSS, Hex↔ASCII, cURL→Code, JSON→Code, HTML→JSX |
| Security & Crypto | JWT Debugger, Certificate Decoder, Certificate Generator, Hash Generator (MD5/SHA), UUID/ULID Generator, K8s Secret Decoder |
| Text & Utilities | RegExp Tester, Cron Parser, Unix Timestamp, URL Parser/Encoder, Color Converter, Text Diff, Line Sorter, String Case Converter, Number Base Converter, Lorem Ipsum, HTML Entity Converter, Backslash Encoder, Markdown Preview, HTML Preview |
git clone https://github.com/nadimtuhin/devutils.git
cd devutils
pnpm install
pnpm devApp is available at http://localhost:5173
| Framework | React 18 |
| Language | TypeScript |
| Bundler | Vite 6 |
| Styling | TailwindCSS |
| Routing | React Router |
| Testing | Jest + React Testing Library |
Contributions are welcome. See CONTRIBUTING.md for guidelines.
Adding a new tool takes ~30 minutes — the codebase is structured to make it straightforward.
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MIT — see LICENSE for details.
Built with ❤️ for developers, by developers | Privacy-first • Open Source • Offline-capable